Patent US4946442A successfully refreshed from Google Patents.
US2989512A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyurethane plastics containing sulfur
Assignee: Bayer AG
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Filing: 1956-06-06
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Granted: 1961-06-20
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Expires: 1976-06-06
Abstract
No abstract record available.
Inventors
- 👤 Nischk Gunther
- 👤 Holtschmidt Hans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:55
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/34; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/52; Y; Y10; Y10S; Y10S528/00; Y10S528/906
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
A POLYURETHANE PLASTIC PREPARED BY A PROCESS WHICH COMPRISES REACTING A POLYALKYLENE ETHER-POLYTHIOETHER HAVING TERMINAL HYDROXYL GROUPS AND A MOLECULAR WEIGHT OF AT LEAST ABOUT 600, SAID POLYALKYLENE ETHER-POLYTHIOETHER CONTAINING IN ITS CHAIN AT LEAST ONE MEMBER SELECTED FROM THE CLASS CONSISTING OF -SO-AND-SO2-GROUPS WHEREIN THE S ATOM LIES BETWEEN CARBON ATOMS OF THE CHAIN, WITH AN EXCESS OF AN ORGANIC POLYISOCYANATE BASED ON THE HYDROXYL GROUPS OF SAID POLYALKYLENE ETHER-POLYTHIOETHER AND A MEMBER SELECTED FROM THE CLASS CONSISTING OF ALKYLENE GLYCOLS, DIAMINES AND WATER TO FORM A CURED POLYURETHANE.
Claim 2
Dependent Claim
90 words
A POLYURETHANE PLASTIC PREPARED BY A PROCESS WHICH COMPRISES REACTING A POLYALKYLENE ETHER-POLYTHIOETHER HAVING TERMINAL HYDROXYL GROUPS AND A MOLECULAR WEIGHT OF AT LEAST ABOUT 600, SAID POLYALKYLENE ETHER-POLYTHIOETHER CONTAINING IN ITS CHAIN AT LEAST ONE MEMBER SELECTED FROM THE CLASS CONSISTING OF -SO-AND-SO2-GROUPS WHEREIN THE S ATOM LIES BETWEEN CARBON ATOMS OF THE CHAIN, WITH AN EXCESS OF AN ORGANIC POLYISOCYANATE BASED ON THE HYDROXYL GROUPS OF SAID POLYALKYLENE ETHER-POLYTHIOETHER AND A MEMBER SELECTED FROM THE CLASS CONSISTING OF ALKYLENE GLYCOLS, DIAMINES AND WATER TO FORM A CURED POLYURETHANE.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-19 | 1964-12-19 | 1965-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-19 | 1968-12-19 | 1969-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-19 | 1972-12-19 | 1973-06-20 | $7700.00 | Window Closed / Lapsed |